Recrystallization Fraction

[luizma...@id.uff.br]

Hi All,

Is there a routine to estimate the recrystallization fraction? 

Regards,

Luiz Maurício

[Rüdiger Kilian]

Hi Luiz,
what would be a criterion to distinguish a recrystallized grain from a non-recrystallized grain. In geomaterials this isn't trivial, but maybe in mteals it is?
Cheers,
Rüdiger

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Subject: {MTEX} Recrystallization Fraction

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[Santhosh Kumar]

Dear Mauricio

Recrystallization fraction can be determined statically using GOS.

It is generally considered if GOS <(1~2deg) its recrystallized. This literature can help .:https://www.scientific.net/KEM.716.317

In mtex use the below code ,

"

plot(grains,grains.GOS/degree)

"

Regards

Santosh Kumar'

Research Scholar

Indira Gandhi Centre for Atomic Research,

https://www.researchgate.net/profile/Santosh_Kumar319

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[Luiz F. G. Morales]

Hi Rüdiger & Luiz

Sorry for the late reply. Indeed, for geological materials this is not trivial, and although I am not an specialist in metals, from the metal literature I know there is also a lot of discussion about this topic. What I would use is the kernel average misorientation (KAM) or grain kernel average misorientation, the has some advantages of GOS (e.g. it is not influenced by twins) but does not show continuous lattice distortion and so on. You can first partition out points neighboring the high angle grain boundaries to prevent them from being considered as deformed material. The definition of what you will consider high and low angle grain boundaries is a matter of big discussion, and you have to try out, 9-10° is a sort of good value for quartz, might be different for metals, but if you go too low you will end up mixing low and high angle boundaries. For the KAM, you can look here

https://mtex-toolbox.github.io/files/doc/EBSD.KAM.html

for gKAM, look here

https://gist.github.com/kilir

After you decide what fits better your EBSD maps and after you calculate grains, you can calculate the area of grains of certain grain size and certain KAM with something like (note that I am just a standard use so certainly the whole thing can be written in one line :D):

 

area_total=sum(grains_all.area);

grains_rx=selected_grains(eq_dia >= XX & eq_dia <= YY & KAM >= xx & KAM <=XX)

grains_rx_area=sum(grains_rx.area);

grains_all_area=sum(selected_grains.area);

area_percent_grains_rx=grains_rx_area/area_total*100

Does this make sense?

all the best

Luiz (the other)

ETH Zürich
Luiz F. G. Morales
Scientific Center for Optical and Electron Microscopy (ScopeM)
HPT D 9
Auguste-Piccard-Hof 1
8093 Zurich, Switzerland
Phone +41 44 633 37 46
E-mail: luiz.m...@scopem.ethz.ch
URL: www.scopem.ethz.ch
URL: https://sites.google.com/site/luizfgmorales/
Skype: lfgmorales

[Luiz Mauricio Barreto De Azevedo]

make perfect sense!

you solved this problem to me. 

thanks

E-mail: luiz.morales@scopem.ethz.ch

URL: www.scopem.ethz.ch
URL: https://sites.google.com/site/luizfgmorales/
Skype: lfgmorales

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Luiz Maurício Barreto de Azevedo

Master´s Degree student

COPPE/UFRJ - Federal University of Rio de Janeiro

PEMM - Metallurgical and Materials Engineering Program

Mobile Phone: +55 22 992180719

E-mail: luizma...@id.uff.br / luizma...@metalmat.ufrj.br